Mark some System.Net.HttpListener APIs as unsupported on browser

src/libraries/System.Net.HttpListener/ref/System.Net.HttpListener.cs

@@ -13,6 +13,7 @@ public HttpListener() { }
         public System.Net.AuthenticationSchemes AuthenticationSchemes { get { throw null; } set { } }
         public System.Net.AuthenticationSchemeSelector? AuthenticationSchemeSelectorDelegate { get { throw null; } set { } }
         public System.Security.Authentication.ExtendedProtection.ServiceNameCollection DefaultServiceNames { get { throw null; } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
         public System.Security.Authentication.ExtendedProtection.ExtendedProtectionPolicy ExtendedProtectionPolicy { get { throw null; } set { } }
         [System.Diagnostics.CodeAnalysis.DisallowNullAttribute]
         public System.Net.HttpListener.ExtendedProtectionSelector? ExtendedProtectionSelectorDelegate { get { throw null; } set { } }
@@ -87,21 +88,25 @@ internal HttpListenerRequest() { }
         public string HttpMethod { get { throw null; } }
         public System.IO.Stream InputStream { get { throw null; } }
         public bool IsAuthenticated { get { throw null; } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
         public bool IsLocal { get { throw null; } }
         public bool IsSecureConnection { get { throw null; } }
         public bool IsWebSocketRequest { get { throw null; } }
         public bool KeepAlive { get { throw null; } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
         public System.Net.IPEndPoint LocalEndPoint { get { throw null; } }
         public System.Version ProtocolVersion { get { throw null; } }
         public System.Collections.Specialized.NameValueCollection QueryString { get { throw null; } }
         public string? RawUrl { get { throw null; } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
         public System.Net.IPEndPoint RemoteEndPoint { get { throw null; } }
         public System.Guid RequestTraceIdentifier { get { throw null; } }
         public string? ServiceName { get { throw null; } }
         public System.Net.TransportContext TransportContext { get { throw null; } }
         public System.Uri? Url { get { throw null; } }
         public System.Uri? UrlReferrer { get { throw null; } }
         public string UserAgent { get { throw null; } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
         public string UserHostAddress { get { throw null; } }
         public string UserHostName { get { throw null; } }
         public string[]? UserLanguages { get { throw null; } }
@@ -125,11 +130,14 @@ internal HttpListenerResponse() { }
         public bool SendChunked { get { throw null; } set { } }
         public int StatusCode { get { throw null; } set { } }
         public string StatusDescription { get { throw null; } set { } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
         public void Abort() { }
         public void AddHeader(string name, string value) { }
         public void AppendCookie(System.Net.Cookie cookie) { }
         public void AppendHeader(string name, string value) { }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
         public void Close() { }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
         public void Close(byte[] responseEntity, bool willBlock) { }
         public void CopyFrom(System.Net.HttpListenerResponse templateResponse) { }
         public void Redirect(string url) { }
@@ -140,10 +148,14 @@ public partial class HttpListenerTimeoutManager
     {
         internal HttpListenerTimeoutManager() { }
         public System.TimeSpan DrainEntityBody { get { throw null; } set { } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
         public System.TimeSpan EntityBody { get { throw null; } [System.Runtime.Versioning.SupportedOSPlatformAttribute("windows")] set { } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
         public System.TimeSpan HeaderWait { get { throw null; } [System.Runtime.Versioning.SupportedOSPlatformAttribute("windows")] set { } }
         public System.TimeSpan IdleConnection { get { throw null; } set { } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
         public long MinSendBytesPerSecond { get { throw null; } [System.Runtime.Versioning.SupportedOSPlatformAttribute("windows")] set { } }
+        [System.Runtime.Versioning.UnsupportedOSPlatformAttribute("browser")]
         public System.TimeSpan RequestQueue { get { throw null; } [System.Runtime.Versioning.SupportedOSPlatformAttribute("windows")] set { } }
     }
 }

src/libraries/System.Net.HttpListener/src/System/Net/HttpListener.cs

@@ -3,6 +3,7 @@
 
 using System.Collections;
 using System.Diagnostics.CodeAnalysis;
+using System.Runtime.Versioning;
 using System.Security.Authentication.ExtendedProtection;
 using System.Text;
 using System.Threading.Tasks;
@@ -78,6 +79,7 @@ public AuthenticationSchemes AuthenticationSchemes
             }
         }
 
+        [UnsupportedOSPlatform("browser")]
         public ExtendedProtectionPolicy ExtendedProtectionPolicy
         {
             get => _extendedProtectionPolicy;

src/libraries/System.Net.HttpListener/src/System/Net/HttpListenerRequest.cs

@@ -7,6 +7,7 @@
 using System.Globalization;
 using System.Net.WebSockets;
 using System.Reflection;
+using System.Runtime.Versioning;
 using System.Security.Cryptography.X509Certificates;
 using System.Text;
 using System.Threading.Tasks;
@@ -110,6 +111,7 @@ public Encoding ContentEncoding
 
         public string? ContentType => Headers[HttpKnownHeaderNames.ContentType];
 
+        [UnsupportedOSPlatform("browser")]
         public bool IsLocal => LocalEndPoint!.Address.Equals(RemoteEndPoint!.Address);
 
         public bool IsWebSocketRequest
@@ -206,6 +208,7 @@ public NameValueCollection QueryString
 
         public string UserAgent => Headers[HttpKnownHeaderNames.UserAgent]!;
 
+        [UnsupportedOSPlatform("browser")]
         public string UserHostAddress => LocalEndPoint!.ToString();
 
         public string UserHostName => Headers[HttpKnownHeaderNames.Host]!;

src/libraries/System.Net.HttpListener/src/System/Net/Managed/HttpListenerRequest.Managed.cs

@@ -34,6 +34,7 @@
 using System.Diagnostics;
 using System.Globalization;
 using System.IO;
+using System.Runtime.Versioning;
 using System.Security.Authentication.ExtendedProtection;
 using System.Security.Cryptography.X509Certificates;
 using System.Text;
@@ -373,8 +374,10 @@ public Stream InputStream
 
         public bool IsSecureConnection => _context.Connection.IsSecure;
 
+        [UnsupportedOSPlatform("browser")]
         public IPEndPoint? LocalEndPoint => _context.Connection.LocalEndPoint;
 
+        [UnsupportedOSPlatform("browser")]
         public IPEndPoint? RemoteEndPoint => _context.Connection.RemoteEndPoint;
 
         public Guid RequestTraceIdentifier { get; } = Guid.NewGuid();

src/libraries/System.Net.HttpListener/src/System/Net/Managed/HttpListenerResponse.Managed.cs

@@ -30,6 +30,7 @@
 
 using System.Globalization;
 using System.IO;
+using System.Runtime.Versioning;
 using System.Text;
 
 namespace System.Net
@@ -92,6 +93,7 @@ public int StatusCode
 
         private void Dispose() => Close(true);
 
+        [UnsupportedOSPlatform("browser")]
         public void Close()
         {
             if (Disposed)
@@ -100,6 +102,7 @@ public void Close()
             Close(false);
         }
 
+        [UnsupportedOSPlatform("browser")]
         public void Abort()
         {
             if (Disposed)
@@ -114,6 +117,7 @@ private void Close(bool force)
             _httpContext!.Connection.Close(force);
         }
 
+        [UnsupportedOSPlatform("browser")]
         public void Close(byte[] responseEntity, bool willBlock)
         {
             CheckDisposed();

src/libraries/System.Net.HttpListener/src/System/Net/Managed/HttpListenerTimeoutManager.Managed.cs

@@ -36,6 +36,7 @@ public TimeSpan IdleConnection
             }
         }
 
+        [UnsupportedOSPlatform("browser")]
         public TimeSpan EntityBody
         {
             get => TimeSpan.Zero;
@@ -47,6 +48,7 @@ public TimeSpan EntityBody
             }
         }
 
+        [UnsupportedOSPlatform("browser")]
         public TimeSpan HeaderWait
         {
             get => TimeSpan.Zero;
@@ -58,6 +60,7 @@ public TimeSpan HeaderWait
             }
         }
 
+        [UnsupportedOSPlatform("browser")]
         public long MinSendBytesPerSecond
         {
             get => 0;
@@ -72,6 +75,7 @@ public long MinSendBytesPerSecond
             }
         }
 
+        [UnsupportedOSPlatform("browser")]
         public TimeSpan RequestQueue
         {
             get => TimeSpan.Zero;

src/libraries/System.Net.HttpListener/src/System/Net/Windows/HttpListenerRequest.Windows.cs

@@ -7,6 +7,7 @@
 using System.IO;
 using System.Net.WebSockets;
 using System.Runtime.InteropServices;
+using System.Runtime.Versioning;
 using System.Security;
 using System.Security.Authentication.ExtendedProtection;
 using System.Security.Cryptography;
@@ -288,6 +289,7 @@ public bool HasEntityBody
             }
         }
 
+        [UnsupportedOSPlatform("browser")]
         public IPEndPoint RemoteEndPoint
         {
             get
@@ -301,6 +303,7 @@ public IPEndPoint RemoteEndPoint
             }
         }
 
+        [UnsupportedOSPlatform("browser")]
         public IPEndPoint LocalEndPoint
         {
             get

src/libraries/System.Net.HttpListener/src/System/Net/Windows/HttpListenerResponse.Windows.cs

@@ -8,6 +8,7 @@
 using System.Text;
 using System.ComponentModel;
 using System.Diagnostics;
+using System.Runtime.Versioning;
 using Microsoft.Win32.SafeHandles;
 
 namespace System.Net
@@ -95,6 +96,7 @@ public Version ProtocolVersion
             }
         }
 
+        [UnsupportedOSPlatform("browser")]
         public void Abort()
         {
             if (Disposed)
@@ -106,6 +108,7 @@ public void Abort()
             HttpListenerContext.Abort();
         }
 
+        [UnsupportedOSPlatform("browser")]
         public void Close()
         {
             try
@@ -118,6 +121,7 @@ public void Close()
             }
         }
 
+        [UnsupportedOSPlatform("browser")]
         public void Close(byte[] responseEntity, bool willBlock)
         {
             CheckDisposed();

src/libraries/System.Net.HttpListener/src/System/Net/Windows/HttpListenerTimeoutManager.Windows.cs

@@ -77,6 +77,7 @@ private void SetTimespanTimeout(Interop.HttpApi.HTTP_TIMEOUT_TYPE type, TimeSpan
         // request, it resets the timer to give the connection another interval.
         //
         // Use TimeSpan.Zero to indiate that system defaults should be used.
+        [UnsupportedOSPlatform("browser")]
         public TimeSpan EntityBody
         {
             get
@@ -115,6 +116,7 @@ public TimeSpan DrainEntityBody
         // it up.  The default timer is 2 minutes.
         //
         // Use TimeSpan.Zero to indiate that system defaults should be used.
+        [UnsupportedOSPlatform("browser")]
         public TimeSpan RequestQueue
         {
             get
@@ -151,6 +153,7 @@ public TimeSpan IdleConnection
         // This timeout is only enforced after the first request on the connection is routed to the application.
         //
         // Use TimeSpan.Zero to indiate that system defaults should be used.
+        [UnsupportedOSPlatform("browser")]
         public TimeSpan HeaderWait
         {
             get
@@ -168,6 +171,7 @@ public TimeSpan HeaderWait
         // bytes-per-second.
         //
         // To disable this timer set it to UInt32.MaxValue
+        [UnsupportedOSPlatform("browser")]
         public long MinSendBytesPerSecond
         {
             get